@chrysophylax thanks for a response!

Finally I solved the issue with SWEEP wallet

My step by step resolution:

At the begging of March I found the conection issue of my SWEEP wallet
First time I of course tried switch off - switch on wallet but with no result
So I began to investigate the problem and found that my provider blocks Tor traffic that used by SWEEP to connect SWEEP network.
The solution for me is become the use of VPN and my SWEEP wallet got connected to the network.
The further step I test sync speed of the wallet from the very beggining. And it turns out VERY slow.

Experement showed full sync of SWEEP wallet from the very beggining lasts about 3-4 weeks at the moment (about 5.6M blocks)

So if you have issues with connection of SWEEP wallet just check the following:

STEP 1. Add active nodes to your sweepstakecoin.conf
Example:
addnode=7ct3pczdcewclvet.onion:17570
addnode=ampnvyxxqicjqxya.onion:17570
addnode=ew2m6nt6dkbz4oz2.onion:17570
addnode=fuohcaaxqrzukplv.onion:17570
addnode=myndjs43cv6w2dir.onion:17570

Active nodes can be found here: https://chainz.cryptoid.info/sweep/#!network
Push node list to see currently active nodes


STEP 2 Check the following setting of SWEEP wallet
Map port using UPnP should be switched ON



STEP 3 Check Tor connection. The simpliest way is to start Tor browser WITHOUT bridge function swithed on. If Tor browser is NOT connected than probably your provider or smth else like Internet connection settings block "standart" Tor traffic. The way to fix it is to use VPN connection for example


NOTE: Synced wallet starts in about 25-40 minutes at current block height of 5 600 000
In debug.log Messages like that appears while starting (from the 1st to the last block):