It really depends on what you're using them for. If you're into photography than either a Mavic 3 or 4 pro would be a nice upgrade over your Mavic 3 Classic; however, if you're just flying for fun then I can see fewer reasons to upgrade your fleet.
I find it interesting to watch the evolution of all the RC aircraft. Dji has been a leader and at the forefront of innovation in the last decade. Their aircraft are in a league of their own with both cameras and flight capabilities. Are they...
The rotor width is 80 cm (2.62 feet) so it's a decent size aircraft and definitely dangerous. Weighs 2.5 kgs (5.5 lbs) with battery so ya, definitely the heaviest aircraft I have flown. Previous was my P3P at 1.2 kgs and that was a tank lol...
Kudos to you for still rocking the P3P! It's a great aircraft and was my first DJI drone. Obvs you have the upgraded board on your GL300 remote which has the HDMI output. I hope you find a solution!