This is probably the best advice a new ham can get.
Welcome to amateur radio!
Proceed carefully when buying equipment. Think about your near-term and long-term priorities and buy accordingly. The latest shiny new radio may not be the best purchase in the long run. With a Technician license, the VHF/UHF bands are wide open to you, but your HF possibilities are limited to a segment of the 10m band plus CW segments on 15m and 40m.
Knowing what kind of operating you want to wind up doing will help you enjoy your purchase more. The RT3S will let you get on local repeaters and close-in simplex, but isn't what's in use for POTA.
From your list of receivers, it looks like you enjoy HF, so upgrading your license is a must to fully enjoy what's avaliable there. Once you've got that done, there are a lot of good HF rigs that will work well for you at home, in the car, and in the parks. There are groups on Facecrook dedicated to POTA and QRP operation where you can find a lot of ideas and suggestions, for whatever they're worth.
Yaesu, Icom, Elecraft, and Xiegu have popular models in this segment. Deciding
how you want to POTA/QRP can help get you the best fit for your needs. Are you going to be day hiking or overnight camping? Are you camping in your vehicle or backpacking into the woods? (Yes, I know you said "participating in POTA once in a while". I know how these things go. "Wow, that was fun! I wish I had the stuff to do
X." Trust me, it's a blast while enjoying the outdoors)
There's lots of stuff you can research on this while upgrading your license so you can get set with a rig you love. No matter what radio you buy, always remember: the antenna is the most important part.
Enjoy!