Professional training is expensive. Instructional designers make good money, classrooms are expensive, and so forth. Personally, I think that you should let an employer pay for such things.

Many folks imagine that a certification is a "Golden Ticket." It is not. The lotsa-money that you pay for one, might well be entirely wasted on you. (Whether it is or isn't ... depends on you.)

I think that it is a much better choice to: "get an entry-level job." Get inside, any way you can. Then, show-up on time, neatly dressed ... listen much more than you talk ... do the tasks that you are given and politely-and-promptly ask for help when needed. You will be surrounded by opportunities to learn.

Most importantly: "people will speak well of you."

My first job was: tearing paper off a line-printer and shoving it through the proper slot. I didn't care: I was on the side of that wall where the machines were. I read every manual in the place (asking permission, of course). I never looked over anyone's shoulder and read a password. I never used a password that was not given to me. I became "trusted" the old-fashioned way ... I earned it.

And I learned stuff, and made connections, that you simply don't get from a book. This was the place where the data-processing concerns of a University were being carried out ... computers were rack-mounted devices the size of bread-boxes at the time. 10-megabyte disks were the size of a small dishwasher and had removable platters.

It's been my career ... and it is still of great personal interest to me ... decades later. I still like to say that I made a living from my hobby.

What I am getting from your post is that you now wonder how to build up on what you gained with Linux+. You may be interested in certs covering cloud computing, like for example the set of certs for Amazon Web Services. I don't think it's big bucks. Your knowledge of Linux most definitely helps.
If you are interested in practical exams but don't want to do RH because it costs a lot (which it does, but when you sum up what you spent on Linux+ exams, it isn't that much costlier), you may want to take the SUSE exam on Linux administration, for which you qualify now that you passed Linux+. It is the next step above the SUSE cert that you automatically get when passing lInux+.
Last time I checked, Oracle was offering certs for its Unbreakable Linux administration.

... yes, but, let me also temper your most-excellent advice with:

"At some point, you'll need to stop 'reading books about swimming' and get in the pool." There does come a point where anything-and-everything that "a[ny...] certification course might teach you" becomes, merely, "book larnin'." That is, "unless, and until," you start balancing it against ... "an actual job."

When you "have a job," you are now inside(!) the organization, and you're establishing yourself as "a known, predictable, professional, dependable [...] quantity" in the eyes of many people whom you encounter during the routine course of any day. Maybe your employer, in some department, is doing something with Cloud Computing. Maybe they've got some existing program that interfaces with Amazon Web Services. Presto! Here's something, now within your (potential, if you play your cards right ...) grasp, that is: "no longer just 'a book about' swimming." Maybe, when the time is right, you can express your sincere interest in joining their team. And, maybe they will, using a bit of their Staff Development budget, send you to that very class! (On their nickel!)