Eventhough your account is quite old you are still a new seller and it's tough for a new seller starting up.
There are LOTS of sellers in the platform now a days and good number of them have few reviews behind them with a bunch of completed orders. So its more likely these request may show up to one of those leveled sellers.
Also ever since fiverr has rolled out "Seller Plus", sellers who are part of this will have priory access to new requests which might also slim the chances of a new sellers getting a buyer request.
I have been also taking long breaks ever since I started selling here on fiverr. Everytime I come back my gigs would have dropped to somewhere close to last page with little to no buyer requests. What I do is I'll fine tune my gigs, will make new gigs matching my skills and try bringing in new buyers to fiverr and I sell them my product. Things will eventually start rolling in again for me.
So this is not me advising you, rather my experience me being on a similar state to you and how I overcome that.