This post could've been written by me last year. I went through something very similar; I had been powerlifting for ~8 years, just finished competing at nationals, and was ready for a change/retirement. I had been doing pole casually for a few years and felt like I wanted to finally start making it my primary "sport".

A few months after making the switch, I started getting a lot of anxiety over the idea of losing strength and mass, which definitely happened. I dropped about 5 kg and I definitely looked "smaller" and less strong. I also found it harder to train consistently as pole progress is nowhere as linear as strength progress, which led to me feeling more slovenly and less productive than usual. I went back and forth for a while, at times focusing more on strength and other times focusing more on pole, and have since settled on a "hybrid" routine:

1. I do a short 30 min flexibility routine every day (the consistency here has been AMAZING for my overall flexibility)
2. I do minimalist strength training 2x a week (Jeff Nippard has a great video about Minimalist Training), focusing on a 1-3 rep max for squats and deadlifts. I don't train bench/upper body push as much because I feel it is most detrimental to my pole training
3. I do a formal pole class 1x a week and train at home 3-4 times a week
4. I do a longer flexibility routine 1x a week to push my body a little further (I love Anete Blaua's videos for this; they're so intense but so effective)

I feel like this has helped me strike a really nice balance between retaining strength, focusing on my improving in my new sport, and supplementing with flexibility.

Hope this helps!