If I have many orders in a queue or If I’m busy, Can I recommend another seller in Fiverr to a buyer?
I think, You can’t. Your account might be banned, if fiverr found any irregularity in your conversation.!!
Just tell your buyer "Fiverr have plenty of other sellers, You can select any of them because i’m overloaded to work!!
You can certainly recommend another seller to a client - I’ve done it a couple of times, but only for gigs I can’t do … and when I’m sure they’ll do a good job.
If you’re going to recommend another seller to do something you could do yourself, be prepared to lose any future business …
You should also consider using the ‘limit orders in queue’ option.