Little play in the front suspension fork (RockShox Judy T2 long travel 98'(?))
That era fork will probably be spring/elastomer or spring/sealed cartridge. I believe the T2 was essentially a glorified Indy. The elastomer will have hardened and no longer be working optimally, so the shocks won't be performing like new (and when new, were not great by todays standards).  The sealed cartridges were not serviceable. The play will be wear.
What to do - nothing is probably the best option. A new fork will be expensive and the best you will do is a a very cheap fork as the technology has changed so much a modern fork will not fit the bike.  Servicing ability if limited to lube and with parts being practically unavailable, any problems could make the fork unserviceable.
A fork service is pretty straight forward - strip the fork, lube the internals with a fork grease, and put it back together.  I cannot remember exactly how - plenty of stuff on the internet if you look.
You may be able to find replacement elastomers, if these were reasonably priced might might be worth it.