Quickleaf
Legend
It really depends what you're looking for.
Commonly, when my OSR friends and I roll 3d6 in order, we're open to play whatever the dice indicate we'd be at least somewhat competent at. For example, those are Rogue scores or possibly Dex-based fighter scores or possibly Ranger scores.
5e mentality is usually different from that, so if you have a specific concept in mind (e.g. Playtest Warlock or Cleric), then yeah you probably need to boost your Wisdom. You could boost it by using Playtest material, e.g. +2 Wis from Background (the Playtests give ability score bonuses based on Background instead of Race), and then further boost it with one of those +1 Wis feats, getting you up to 15.
Alternately, you could ask for me to homebrew a magic item – as your bennie for doing old school rolling. I'd need to understand exactly what you're trying to achieve first, however.
Alternately alternately, you could play a build that almost never relies on spell attacks or saving throws. Examples I've seen in play are the auto-damage spellcaster (magic missile, cloud of daggers, etc), and a buff-focused cleric.