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Is there any way at all other than delivering boxes to maybe get your strength up? I deliver boxes all day long and when nobody has a box I either go to a different town or go hunting but it hasn't gone up in days. It's only at 56.

Delivering boxes should still give you some gains at 56, but you can try finding someone to help you do guard quests. They have a better chance of giving a stat increase.

oh I never thought of that. Thanks for the suggestion.

Manual tells that you can get up to 75 on a stat with just delivering boxes. This information might not be up-to-date but i did run around 50 boxes per day on my chars when they were new, got stats up in no time
Then just hunted so i got str to 90 on tanks