Congrats on your Tech license.
I have my Amateur Extra license. To me, the wonderful world of ham radio really opened up for me after I got my General license. I originally got into the hobby as a Novice back in 1987. I upgraded to Tech Plus (Technician plus Morse Code) around 1990-91. It wasn't until 2005 or so that I upgraded to General and then Extra a couple of years later.
There are so many facets of this hobby to explore. Upgrading to General is a way to multiply those possibilities. In the HF bands, you can operate contests, and/or ragchew is multiple methods. CW, Digital modes like PSK31, RTTY, and Packet as well as various phone(voice) modes such as AM, FM, and SSB are found on the HF bands. There are too many modes to list here that you can get into with a General or Amateur Extra license.
In the 20+ years I've been a ham, I've played with the repeaters on 2m, 220 and 440, packet, and dabled with APRS. But after getting on HF, I've had the most fun I've ever had in Ham Radio. I've worked contests and special events and have talked to people half-way around the world that I would have probably never had the opportunity to otherwise.
It's your decision to go for your General or not. My recommendation would be to go for it. I also see another option that I don't know if you have thought about or not. Let your son get his Technician and then both of you study for and take the General exam together. Talk about creating memories. Just my 2 cents worth.
Good luck and congratulations again.
73,
Wayne, W4SYK