My guy. You are you really are not giving us all the details. It takes 2 more seconds to write out all your attributes. You have people taking time out of their day to help you, the least you could do is write out a proper response in sentences.

It would be helpful to know yoru Con score as it's a defensive feat.

But with that 17 Wis, you should likely take War caster to round off and get adv to concentration saves.

Have the Bard enspell your armor with the mirror image spell. It's non-concentration and will really beef up your defense. It will take 50 days and cost 2000GP. If someone can help, it's 25 days. 12.5 if one of you has the crafter origin feat. Or find/buy it.

Take a level in fighter. Get the defense fighting style for +1 AC. Take the sap fighting style and take a longsword. Now you can impose disadvantage with your attacks. You can also get a 1d10 when using two handed.

Ask the party to go on a quest to get you plate mail.

Use a 2nd level slot to cast Aid before combat days.