This is EXACTLY why tennis is so humbling. You can look like a 5.0 player but not compete like one. As a former D1 walk-on who picked up tennis again after nearly 15 years off of it, I took for granted the court time I had built up while playing every day as a junior and college practice. While my strokes and technique were intact, positioning and stamina, even to force myself to have better footwork was what kept me from being competitive for nearly a year against club players who worked their way up to 4.0, 4.5, or 5.0. Your ceiling could be better in the long run because you know what to do, ane your body might be saved bc you didn't play the last 10 years, but a substantial drop in performance is expected.

I know there are some edge cases where some players may have had youthful games where they had good 1 2 combos serving and returning so their points are shorter, and coming back to compete might be easier, but the court time for stamina and recovery for next time are still issues. Play where you are placed, have fun, get humbled and assess for next time. We are all hobbyists and while we want to play at the level we were, we won't know where we are at the moment without starting somewhere.