Any suggestions which multicoin wallet to use instead?
You surely know better than to ask me that question. Here's my solution: Electrum for Bitcoin and Monerujo for Monero. Sell all your shitcoins for one of these two. 
I thought this could be the third one in the list too.Extensions wallets like Metamask can also be used on mobile with extension supported browsers like Kiwi/Lemur/Mises (search on play store), on iOS there is orion browser with extension support too but I'm not sure if it extensions work there as good.
Wallets with inbuilt browsers are hit or miss on properly rendering the Dapps so I prefer extensions.
Regarding Monero, I came across this Elite wallet [2] which is also open source [3].
Their subreddit paints a similarly bleak picture: https://www.reddit.com/r/coinomi. Lots of posts of people being unable to spend coins, unable to sync, getting a variety of error messages, etc. The comment section for each of those posts is just filled with spam.
Similar thing happen on their play store (Android) if you sort it's review by newest date. Although Coinomi still have 4.5 stars and play store decide to show old review with 4-5 stars. That happens if you select 'Most Relevant', with "Most Recent" new ones appear.
It looks like they've abandoned the project but left some existing servers running.
Like in this case, Coinomi stopped upgrading the wallet and you never know they may close the service one day.If it adds to anything, I tried their live chat, they responded well after half an hour.