Journal article suggestion website or application
There are quite a few paper recommender systems (a highly active area of research, by the way; see this Google Scholar search on &quot;paper recommender systems&quot;). They first draw from a corpus of research publications you 'follow', have read or stored; second, they use algorithms to find related papers; and third, they recommend these related papers to you.
To name a few platforms:

Google Scholar: You can 'follow' Google Scholar profiles with the option to get e-mail alerts with publications related to the followed
profiles' research. This is possibly the widely used approach.
ResearchGate: You can 'follow' ResearchGate profiles, and the RG main site will show you papers related to their publications.
Academia.edu: Same like ResearchGate, but including with the option to get e-mail alerts.
Mendeley: If you use Mendeley, its feature &quot;Mendeley Suggest&quot; sends you (I think weekly?) e-mails to recommend similar papers to
you as the ones you have stored.
Twitter: Follow journals and 'journal lists' (an aggregation of Twitter profiles of journals, such as this one on Political
Science) on Twitter, and you will see them announcing their newest publications in your Twitter feed.

In addition, there are some platforms that require you to type in a DOI of a paper and that then search for papers that are in a co-citational relationship with the DOIs. Just some examples:

CitationGecko: https://citationgecko.azurewebsites.net/
ConnectedPapers: https://www.connectedpapers.com/
CoCites: https://www.cocites.com/