Welcome to TeX.SE! See if the package cuted and its environment strip can help you. As example of its use, see https://tex.stackexchange.com/questions/368080
– ZarkoMay 04 '20 at 08:15
2
One approach is to use multicol. While multicol does not support floats, odds are you don't want your figures to float anyway. So you end and begin multicol whenever you add a figure (in onecolumn). See also https://tex.stackexchange.com/questions/329709/how-to-put-figure-at-middle-or-at-desired-position-on-a-page/531802?r=SearchResults&s=1|35.3145#531802
– John KormyloMay 04 '20 at 13:15
cutedand its environmentstripcan help you. As example of its use, see https://tex.stackexchange.com/questions/368080 – Zarko May 04 '20 at 08:15