There are domain registrar that provide the email catch all and forwarding service that is included in the domain registration fee or as an add on fee.
I assume you are now paying domain name registration fee (yearly) + GSuite fee (monthly). So it might lower your cost if you transfer your domain to such registrar. (Assuming you can/want to do that.)
If you provide your top-level domain (ie .com, .net, .eu, .de, ... etc), I may be able to suggest such a registrar.
Came across this solution for .pl domain.
Gandi provide .pl domain and comes with "unlimited aliases and forwarding addresses". The .pl price is €20 per year. So it would come down to what you are paying for your domain now.